Two-cycle-engine construction



Patented Jan. 65, 1931 ALBERT w GOLTER, orransmo, nrcHIGAN rwo-cyotn-nnernn cons'rnucrron Application filed January 23,1925} sena e. 334,475.- ,I v v i This invention relates to two cycle internal combustion motors having cylinders and pistons of different external diameters, the cylinder in which the combustion takes place being the. larger, and both cylinders having the same axial line. p Y I It is an object of this invention to avoidall hollow air pockets" or indirect passages between theend of the fuel pump piston and fuel pump cylinderwhic'h hinder the effect of the, suction, and it is believed that this invention sets out a superior methodof constructing the fueling systems of such engines.

It is also an object of this invention to provide means whereby the entering fuel gas effects a scavenging action ofthe interior of the pump cylinder above the piston, and the gas entering the compartment of the pump cylinder exerts a like cleaning effort in the compartment, and finally the fuel entering the combustion chamber-drives out the burned gases, all without indirect passages or pockets. l I r The special construction of this invention is illustrated in'the accompanying drawings, of which Fig. 1 represents a Vertical section of one form thereof, all parts being shown assembled, and Fig. 2 is a like vertical sectionof a portion of a modified form of this invention. 7 7 I Throughout the drawings and description the-same number refers to thesame part.- 7

Considering the drawings, Fig. 1, a pump cylinder 1 has an inlet for fuel 2 controlled by th'e valve 3 all of customary form and action. A pump cylinder piston al as, at the top ports 5 in a topcompartment 6. At a lower point the compartment has outlet ports 7 which discharge fuel into the combustion chamber 8 formed by the inner wall of the motorcylinder 9 and the outer wall of the-pump piston 4. The ignition may be by spark plugs 10. The motor cylinder has an exhaust port 11 controlled by the movements of the motor piston, and thisport may have an exhaust pipe opening directly into the air outside the motor, or the pipe may be led to a chamber 12 encircling thepump cylinder to heat the in-coming charge of fuel gas. It will be understood that the encircling chamber 12 h s an Outlet, notjshownfto idis charge the burned gases externally, This; in ventionlis not limited directly to thelprecijse forms, sizes or arrangements of theelernent's illustrated. {ii I. f Themodified formshown Fig.2 is the same in purpose and effect, "as the first, form described. The inlet :maiiifold'13 has an inlet valvel l located in the headofthe pump cylinder 15. The pump piston 16 has in its top an'inlet valve 17 and a compartment 18 provided at a lower point with the outlet ports 19 to feed the combustion chamber 20 in which reciprocates the motor piston 21. The motor piston controls an exhaust port not shown but the same as that set out in Fig. 1. The position of the exhaust port may be variously located, but it is preferably opened near the lower termination-of the stroke. p The operation is the samein both forms of this invention illustrated." The entering fuel scavenges the fuel space, and'is compressed by the pump piston. The compressed fuel enters the compartments of the pump cylinders, and violently agitates any remaining gases therein, so that when the lower portion of the stroke is reached, the outflow into the combustion chambers clears'outthe whole or the majorportion each time of any so remainder gas in the compartment, which as stated is fuel gas. It will be noted that when the fuel streams from the .compart- 'ments of the pump pistons into the combustion chambers, it enters the upper parts of 35 the combustion chambers and drives the Y burned gases out of the temporarily opened exhaust port. There are no tortuous passages forithe escape of the used gases, as

the exhaust may be into open air as stated.

pump andmotor'cylinders ofa co-axial pump o 7 piston and motor piston, said pump cylinder having a fuel inlet valve at the top, said pump piston being arranged to compress the fuel charge in the top of the cylinder, said pumppiston having a compartment at the v, top provided with a plurality 'of'inlets'in the sidewallslocatd at "the top of the said compartment whereby the compartment receives the compressed charge in the highest position of the pump piston, a combustion chamber formed by the inner wall Of'tllBflIlOtOXlCYliIli-i Ti .1; der and the outer Wall of the pump piston,

said inlets of the pumppiston'beinga-rrangd todischarge the fuel into the said combustion chamber at the mp thereof, the :said motor cylinder having 'an' eiz'haust :por't controlled 7 1 by the motor piston,saidpump'cylinderhav ingfan encircling "chamber, and anex'haust 20 ipe g'fr m aid exhaustp'Qftftoisaid chamber to heat thefenterfing fuel.

In l 'y l hg odflei x my ignat r 

